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having trouble solving this, If anyone could even give me a tip to get started.

What I don't understand is,

Q1 how do you get the v^2 into an ode? how do I get rid of the square? If i derive it, I'll loose the drag coefficient d and thus can't solve Q2. If I was to then get v on it's own into an ODE. I'm not sure how to find d as i'll still have m as an unknown.

Q5 How do I find the spring stiffness k as I have the other unknowns of c and m.

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